{"id":"F2006B03753","name":"AD/BEECH 23/39 Amdt 1 - Fuel Selector Stop and Decal","slug":"ad-beech-23-39-amdt-1-fuel-selector-stop-and-decal","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43347,"registerId":"commonwealth-F2006B03753-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 23/39 Amdt 1 - Fuel Selector Stop and Decal","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBeechcraft 19, 23 and 24 Series Aeroplanes\n\nAD/BEECH 23/39\n\nAmdt 1\n\n  \nFuel Selector Stop and Decal 5/85\n\nApplicability: Models A23-19, 19A, M19A and B19 with S/Nos. MB-1 to MB-520.\n\nModels B19 Sport 150 with S/Nos MB-521 to MB-905.\n\nModels 23, A23, A23A, B23 and C23 with S/No. M-1 to M-1361. Models C23 Sundowner 180 with S/Nos M-1362 to M-2223.\n\nModels A23-24 and A24 with S/Nos. MA-1 to MA-368. Model A24R with S/Nos. MC-2 to MC-95.\n\nModels A24R, B24R and C24R Sierra 200 with S/Nos. MC-96 to MC-688, MC-690 to MC-695.\n\nRequirement: Action in accordance with Beechcraft SB No 2053.\n\nCompliance: Prior to the issue of the next Maintenance Release after 31 May 1985.\n\nNote: Compliance with the previous issue of this Directive constitutes compliance with this issue.\n\nBackground: The previous Requirement Document SI1095 has been superseded, and cancelled, by the issue of SB2053. This service document reflects changes to the applicability.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The AD replaces the earlier Requirement Document SI1095 with Beechcraft SB No. 2053 and states that the service document \"reflects changes to the applicability\" (Background). In other words, the primary scope change is an update to which serial-numbered airframes and models are covered. The compliance obligation (to carry out the SB2053 work) and the compliance timing remain expressed in the AD (Requirement; Compliance), and the AD explicitly preserves prior compliance with the earlier Directive as satisfying this issue (Note)."},"complexity_factors":["Detailed applicability: multiple models with several serial-number ranges increases administrative tracking","Mandate references an external technical document (Beechcraft SB No. 2053) rather than setting out technical steps in the AD","Compliance timing tied to the next Maintenance Release after a fixed date creates a scheduling constraint","Note allowing prior-compliance to satisfy requirement reduces duplication but requires verification of earlier work","Background replacement of a previous requirement document (SI1095) requires checking historical compliance records"],"plain_english_summary":"This AD requires owners/operators of specified Beechcraft Model 19, 23 and 24 airframes (by serial-number ranges) to install or modify the fuel selector stop and decal per Beechcraft Service Bulletin No. 2053. Work must be completed before the next Maintenance Release after 31 May 1985; the operator bears the cost. Prior compliance with the earlier directive satisfies this requirement."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a minor amendment (Amendment 1) that simply updates the reference document from SI1095 to SB2053 and adjusts applicability accordingly. The core safety purpose — mandating a fuel selector modification — remains unchanged from the original directive."},"complexity_factors":["Very short document (under 300 words)","Only 1 substantive requirement (comply with referenced service bulletin)","Applicability defined by simple serial number ranges","Single compliance deadline with clear trigger event (next Maintenance Release after fixed date)","No defined terms section, no cross-references to other legislation beyond the parent Civil Aviation Regulations","Simple background explanation (supersession of previous document)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order for aircraft owners and operators. It applies to specific models of **Beechcraft 19, 23 and 24 series aeroplanes** (light aircraft).\n\n**What it requires:**\n- Aircraft owners must follow the instructions in **Beechcraft Service Bulletin No. 2053** regarding the **fuel selector stop and decal** (a physical stop mechanism and warning label on the fuel selector valve that prevents the pilot from accidentally selecting an empty fuel tank or an unsafe fuel position).\n\n**Who must comply:**\n- Owners and operators of the listed Beechcraft models with specific serial numbers (covering various Musketeer, Sport, Sundowner and Sierra models from the 1960s–1980s).\n\n**When:**\n- Before the aircraft's next **Maintenance Release** (a formal certificate allowing the aircraft to fly, issued after maintenance checks) after **31 May 1985**.\n\n**Why it matters:**\n- This prevents fuel starvation accidents. If a pilot accidentally selects a fuel tank position that cuts off fuel flow, the engine can stop. The stop and decal modification ensures the fuel selector physically cannot be moved to unsafe positions and clearly warns the pilot.\n\n**Key note:** If you already complied with the earlier version of this directive, you're done — no need to do it again."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-23-39-amdt-1-fuel-selector-stop-and-decal","history":"/api/acts/ad-beech-23-39-amdt-1-fuel-selector-stop-and-decal/history","analysis":"/api/acts/ad-beech-23-39-amdt-1-fuel-selector-stop-and-decal/analysis","conflicts":"/api/acts/ad-beech-23-39-amdt-1-fuel-selector-stop-and-decal/conflicts","importantCases":"/api/acts/ad-beech-23-39-amdt-1-fuel-selector-stop-and-decal/important-cases","documents":"/api/acts/ad-beech-23-39-amdt-1-fuel-selector-stop-and-decal/documents"}}